JSAR Innovate Technology Award: Development of Ovulation Synchronization and Fixed Time Artificial Insemination in Dairy Cows

• YAMADA Kyoji

  Shibetsu Veterinary Clinical Center, Nemuro District NOSAI

書誌事項

タイトル別名

• Development of Ovulation Synchronization and Fixed Time Artificial Insemination in Dairy Cows

抄録

Recently, reproductive management has become more difficult as a result of increased herd size. Problems with missing estrous signs and decrease in conception rate by artificial insemination (AI) performed at wrong timing have caused low AI conception rates. In 1995, ovulation synchronization and fixed-time AI (Ovsynch/TAI) was developed in the USA as a new reproductive technology, which was accepted as an useful reproductive management tool in many countries. However, no information on the use of Ovsynch/TAI was available in Japan. It was, therefore, warranted to show the ovulation rate and conception rate after Ovsynch/TAI using gonadotropin releasing hormone analogue (GnRH-A, fertirelin acetate) and prostaglandin F_2α (PGF_2α)-THAM, both were commercially available in this country. The conception rate after Ovsynch/TAI has been known to vary among different herds and individuals. Investigation and analysis of factors affecting the conception rate was also warranted to improve the conception rate. A series of experiments were carried out to establish Ovsynch/TAI using domestically produced GnRH-A and PGF_2α and to study factors affecting conception rate after Ovsynch protocol. Ovsynch using 100 μg GnRH-A and 25 mg PGF_2α were observed using ultrasonography. As a result, a high synchronization rate of ovulation at 16 to 20 h after the second GnRH injection was confirmed. The conception rate after Ovsynch/TAI was compared in 87 cows with the conception rate after AI at estrus induced by PGF_2α (139 cows). Conception rate after Ovsynch/TAI was higher than the figure after AI at induced estrus (59.1% vs 20.9%, P<0.05). The dose of GnRH-A was also studied and a practical dose of GnRH-A was found to be 50 μg per cow. To clarify some factors affecting the conception rate after Ovsynch/TAI, 1,558 cows were investigated for the state of their ovaries, days after calving, parity, season, ovarian cyclicity postpartum and nutritional state at the day of Ovsynch. The overall conception rate after Ovsynch/TAI was 51.5%. Fifty-six cows (3.6%) showed estrus at 6 to 7 d after the first injection of GnRH-A. The conception rate after Ovsynch/TAI was low in cows that were 40 to 60 d postpartum, those in their 5th lactation or more, those bred in July to August, and those recovering ovarian cyclicity later than 56 d postpartum. The conception rate after Ovsynch/TAI was high in cows in which body condition score (BCS) was 3.75 at dry period and 3.0 at the day of Ovsynch. In conclusion, Ovsynch/TAI is an effective tool for the reproductive management of dairy cows. A steady and sufficient conception rate after Ovsynch/TAI could be expected by taking the factors affecting the conception rate into the consideration.<br>

収録刊行物

• Journal of Reproduction and Development

  Journal of Reproduction and Development 51 (2), 177-186, 2005

  公益社団法人 日本繁殖生物学会

キーワード

• Artificial insemination
• Dairy cow
• Estrus
• Ovulation synchronization

詳細情報

• CRID: 1390282681312428800
• NII論文ID: 10027324167
• NII書誌ID: AA10936678
• DOI: 10.1262/jrd.16103
• ISSN: 13484400
• ISSN: 09168818
• NDL書誌ID: 7305428
• PubMed: 15883484
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7305428
• Web Site: http://www.jstage.jst.go.jp/article/jrd/51/2/51_2_177/_pdf
• Web Site: https://search.jamas.or.jp/link/ui/2005261782
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • PubMed
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可